Here is a Brazilian agate over glass set in a highly figured beeswing Narra pot with a canarywood striker. The pitch is a bit high with this striker but with other strikers you get a wide variety of tones. A very rare and versatile call.

Thanks for the comments fellas. I like the agate a lot too, it's fun to work with something that very few people use in their calls. This one has a bid on it already on ebay so it wont be part of my vest collection this year.